Final answer:
B. combustion. Combustion is the process that represents a chemical reaction, in which substances react with oxygen, emitting heat and resulting in new products with different compositions.
Step-by-step explanation:
The process that is a chemical reaction among the options provided is B. combustion. Combustion is a chemical chang. e in which a substance reacts rapidly with oxygen and gives off heat. Other processes listed, such as distillation, filtration, condensation, and sublimation, are physical changes. They involve changes in the state of matter or separation of mixtures without altering the chemical composition of the substance(s).
Chemical reactions are characterized by the formation of new substances with different properties and compositions than the original substances. In contrast, physical changes involve a change in the physical properties of a substance, such as phase changes represented by condensation and sublimation or separation techniques like distillation and filtration. Combustion, as the only chemical reaction listed, involves the transformation of reactants into different products, exemplifying a change in chemical composition.